We prioritise maximum return for our clients
through a dynamic, personal and
results-driven approach

Sabios specialises in partnering with corporate and individual clients to solve complex challenges
and unlock value, ensuring optimal outcomes across a range of services including Tax, Financial Advisory
and Restructuring. That means providing sharp, unambiguous, clear-cut advice –
with the practical support to put that advice into action.

Our Leadership

Aidan García


Financial Advisory, Corporate Restructuring & Tax

AITI, QFA, Licensed IP

Aidan has been providing specialist Financial, Tax and Corporate Restructuring advisory for more than a decade, with extensive experience across a wide range of industries including hospitality, leisure, property, construction, retail, transport, and heavy manufacturing.

He was Managing Director of CollinsGarcía for eight years before the firm rebranded as Sabios in 2020, propelled by Aidan’s reputation and the original firm’s impressive portfolio of work. Prior to founding CollinsGarcía, Aidan worked in industry for a well-known agri-food business.  

Aidan has advised on all aspects of Corporate Restructuring including Corporate Investigations, Restructurings, Insolvency and Tax based litigation. He has acted as Liquidator, Receiver and Examiner on over 200 cases, and regularly oversees complex litigation cases in Commercial Court.

Due to his extensive experience in such matters, Aidan has acted as an expert witness in numerous insolvency and tax cases, and he is a member of the Revenue Commissioners panel of Insolvency Practitioners.

Aidan has particular expertise in VAT on property; Capital taxes on development land; taxation considerations arising from property development; and close company taxation issues, as well as cross-border tax advice between Ireland and a number of other EU countries.

Formerly an international amateur and professional boxer, Aidan applies the drive and focus of a sports career to the pursuit of results for clients. He regularly takes audit/investigation/appeal cases for taxpayers in Ireland and is accustomed to handling complex litigation across the full spectrum of restructuring and tax, ensuring clarity and resolution for key stakeholders.

A licensed Corporate Insolvency Practitioner, Aidan is also a Chartered Tax Advisor (CTA, AITI), a Qualified Financial Advisor, Qualified Stockbroker and a Qualified Personal Insolvency Practitioner.

E      aidan.garcia@sabios.ie

T    +353 (0) 1 598 ‍0800

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E      mark.lonergan@sabios.ie

T    +353 (0) 1 598 ‍0800

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Mark Lonergan




A qualified Barrister, Chartered Accountant and Chartered Tax Adviser, Mark has been providing specialist Tax advisory for more than twenty years, with a particular focus on tax issues for SMEs and Private Clients.

Prior to joining Sabios, Mark trained with a big four firm and worked in senior roles with various medium sized accountancy practices.

In addition to assisting SMEs and private individuals, Mark’s expertise in tax matters allows him to provide specialist consultancy services to other accounting/legal professionals. 

Mark has particular expertise in VAT on property, taxation considerations arising from property development, and company cash extraction issues, as well as succession planning for High Net Worth Individuals.

As taxation is a multifaceted discipline, Mark takes a holistic approach to supporting clients, considering their tax issues from all angles, including legal, accountancy and commercial. A tax problem can often be solved by a company law provision, the application of an accounting standard, or indeed the application of EU Law.

Mark also has significant experience in dealing with Revenue in contentious situations including Audits, Investigation and Tax Appeals. He has been involved in hundreds of Revenue Audits and numerous appeals at High Court level.

Mark has lectured on accountancy, taxation and law in various third-level colleges and to professional bodies. He regularly publishes articles in Tax/Accountancy Journals, as well as in publications like the Sunday Business Post and the Village.

Outside of fiscal matters, Mark’s principal interest is in attending Hurling matches, and he was a long suffering Limerick Supporter until 2 years ago!

Terry Leggett

Non-Executive Director

Terry was a Senior Partner in Eugene F Collins, with over 40 years’ experience. 

While dealing mostly in commercial litigation, Terry has specialised throughout his career in banking and financial product litigation. 

Amongst other expertise, Terry has significant experience in the area of Corporate Recovery Law and has extensive experience in litigation relating to this field. 

Terry also frequently advises on Regulatory matters for State Bodies or Associations.

T    +353 (0) 1 598 ‍0800

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Tel:           +353 (0) 1 598 0800

Email:      info@sabios.ie


4 Waterloo Rd, Ballsbridge, Dublin D04 A0X3

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